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Orthogonal views of the H-bond interactions (cyan dashed lines) between the amino acid side chain (yellow carbons) and tetraphosphonate cavitand (black carbons) (a,b) 2 Tiiii[H, CH3, CH3]• Lys 2HCl complex; (c,d) 2 Tiiii[H, CH3, CH3]• His 2HCl complex. Hydrogen atoms have been omitted for clarity.
